Captain Midnight, Chuck Ramsay, Ichabod "Icky" Mudd, Major Steele, Ivan Shark, Fury Shark, Fang, and Henchman Gardo are all carry-over characters from the Captain Midnight radio program. All of the other characters in this serial are new and have never appeared before in a Captain Midnight story.
Chapter 1: Mysterious Pilot (Certificate #7861)
The airplane that Martel, Henchman #7 flies, is a Stinson Model A Tri-motor airplane.
Chapter 2: The Stolen Range Finder (Certificate #7862)
The airplane used the most by Captain Midnight, Chuck and Icky, is the Lockheed Vega 5C mail and passenger plane from 1929.